Annals of the Transvaal Museum 
251 
species; I found a tibial spur present on 1-11 legs, 1-4 (-5) legs and on 1-9 
legs in R. peter si. Porath says of R. petevsi : “ paria 1-3 (num plures ?) praeterea 
articulo antepenultimo spinula 1.” 
He tabulates the differences between the two species as follows : 
Rhysida petevsi. 
Anal legs comparatively longer. 
The lower side of anal legs provided 
with only one spine. 
Pleurae generally without lateral spine. 
Scuta faintly but clearly punctured 
(pointed). 
The penultimate pair of legs a little 
shorter than anal legs, and the 
difference between them and the 
antepenultimate is greater than 
between the same and the anal legs. 
Colour of legs lighter. 
I ascertained the following difference : 
Mandible with five teeth (fig. 10). 
Rhysida afra. 
Anal legs are comparatively shorter; a 
little more than 14 mm., against a 
body length of 55 mm. 
The lower side of anal legs provided 
with two spines. (There may be 
from three to four spines on femur of 
anal legs. C. S. Grobbelaar.) 
Pleurae generally provided with a 
lateral spine. 
The dorsal segments of the body appear 
smooth (Peters) . 
The penultimate pair of legs agree much 
more with the antepenultimate than 
with the anal legs. 
Legs a little lighter than colour of the 
body. 
Mandible with four teeth (figs. 8, 9). 
Sub-family SCOLOPENDRINAE. 
Key to the South African genera 
(adapted from Kraepelin, loc. cit.). 
1 . Proximal tarsus of the legs clearly longer than the distal. Twenty-one 
somites ........... 2 
2 . Pleurae non-porous, smooth, almost covered by the anal sternite (fig. 
13) of the anal somite, abbreviated, without trace of a process. 
Antennae very short, at most reaching to the end of the first tergite 3 
Pleurae distinctly porous, free, always provided with a process carrying 
one, two or more spines. Antennae longer, always extending beyond 
the first tergite .......... 4 
3 . Head-plate not overlapped posteriorly by the first tergite, free. Four 
eyes flush with the surface. Second shorter than the first. Antennae 
extend to the end of the first tergite .... Asanada Meinert 
4 . First tergite usually without a pair of complete median sulci. Claws of 
anal legs seldom longer or as long as the distal tarsus, the under side 
usually concave measured from the base (cf. however, Arthrorhabdus). 
Stigmata usually elongate ........ 5 
5 . All walking legs without tarsal spurs ...... 6 
All walking legs (exc. the last) with tarsal spurs .... 10 
6. Process of pleura armed with many spines at the end (multi-pointed); 
head-plate usually overlaps first tergite, seldom overlapped by it . 7 
Process of pleura ends in a single spine, mostly in two spines or bifid 
and seldom in three, or entirely without spines. Posterior margin of 
head-plate usually overlapped by first tergite (Old-World) . . 8 
7 . Head-plate with distinct basal plates at base. Pleurae short, cylindri- 
form. Segments of antennae all shorter than broad 
Hemicormocephalus Kraepelin 
